What is inside the two interesting towers of this ship?

echosounding equipment

radars

missile launchers

drills

USS San Antonio, the lead ship of her class of am­phibi­ous trans­port dock, is designed to deliver up to 800 Marines ashore. As the vessel in­cor­po­rates stealth fea­tures, its major antennas are mounted on plat­forms inside two Advanced Enclosed Mas­t/Sen­sor systems rather than on tra­di­tion­al mast yardarm­s.